Prototype Model Unit XJ-3

Physical Information

Age Unknown (toddler-like in mentality)
Gender Female
Species Robot
Eye color Black
Hair color None
Weight Unknown
Height Unknown

Basic information

Residence Tremorton
Occupation Superhero/crime fighter (When awake)
Nicknames None
Likes Helping people, saving the world
Dislikes The Cluster, Smytus, falling apart uncontrollably

Relationship information

Love interests None
Family Nora Wakeman (creator/mother)
XJ-1, XJ-2 (early prototypes/sisters), XJ-4, XJ-5, XJ-6, XJ-7, XJ-8, XJ-9 (later sisters)
Wisteria Wakeman (aunt)
Glenn Wakeman (cousin)
Friends Brad Carbunkle, Tuck Carbunkle
Enemies Smytus, Dr. Locus, The Cluster

Production information

First appearance "Sibling Tsunami"
Last appearance "Turncoats"
Voiced by: None

Prototype Model Unit XJ-3 is the third sister of Jenny.

Appearance and Personality

XJ-3 is a small, cute XJ prototype robot. She appears as a smaller, toddler-like version of Jenny with only one eye, two pincers as hands, and rounder in shape. She is not very stable, and thus, falls apart easily, and is very awkward and very clumsy on her feet, often falling down. In terms of robotic development, she represents a toddler who is just beginning to learn how to walk. Her biggest weakness is her clumsiness, and her body is easily disassembled.


XJ-3 can create hammers on her hands (shown in Sister Sledgehammer), and can form a spinning scorpion tail (shown in Turncoats).



  • Because she can't talk, XJ-3 is the only XJ robot to not have a voice actor.
  • She seems to be the XJ-Sister who receives the most repairs by Dr. Wakeman, or gets 'cleaned up' by XJ-4, due to her constantly falling apart and needing reassembly.